What are the grades of binocular vision?
Grade I: simultaneous perception: the ability to see an image simultaneously with both eyes, even if it is totally different. Grade II: fusion: the ability to fuse two slightly disparate images into a coherent whole. Grade III: stereopsis: three-dimensional depth perception. Stereopsis exists because two fused images are seen slightly differently in the two eyes simply because of the separation between the two eyes. Thus the optical exercises are designed to help and improve binocular vision. What exercises are used to improve visual power of an eye using optical methods? What is pleoptics? Pleoptics is the technique of using light to stimulate or dazzle parts of the retina and give it a proper foveal direction, and is the most sophisticated method available. The visual acuity of the eye is highest in the part of the retina termed the fovea. Hence in an effort to improve the vision, the eye must be trained to look at objects using the fovea or, to put it simply, in a proper foveal dire
